@import url('reset.css');

html,body{
    height: 100%;
    background: blue;
    color: #fff;
}

.mainwrapper{
    margin: 10px;
    height: 100%;    
}
.logout{
    display: block;
    float: right;
    color: #fff;
}

section{
    display: block;
    margin: 0 auto;
    padding-top: 50px;
    width: 800px;
    max-width: 100%;
}
#container31{
    text-align: center;
    font-size: 30px;
}

#main-page{
    text-align: center;
    width: 800px;
    max-width: 100%;
    height: auto;
}

#cauhoi{
    font-weight: bold;
    font-size: 24px;
    margin-bottom: 30px;
    display: block;
}
.ketqua{
    display: inline-block;
    height: 45px;
    width: 500px;
    max-width: 100%;    
    line-height: 45px;
    font-size: 20px;
    margin: 5px auto;
    border: 1px solid #fff;   
}

.red{background-color: red;}
.green{background-color: green;}

table{
    margin: 50px auto 0;
}
table thead{
    margin-bottom: 10px;
    display: table-caption;
}